Open AccessMagnetic ordering in the spinel compound Li[Mn2−xLix]O4(x=,0.04)
Author(s) -
John Gaddy,
Jagat Lamsal,
Marcus Petrovic,
Wouter Montfrooij,
A.J.M. Schmets,
Thomas Vojta
Publication year - 2009
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.3073660
Subject(s) - antiferromagnetism , spinel , charge ordering , ion , formula unit , stoichiometry , lithium (medication) , crystallography , magnetic susceptibility , atmospheric temperature range , chemistry , charge (physics) , crystal structure , materials science , condensed matter physics , physics , thermodynamics , metallurgy , medicine , organic chemistry , quantum mechanics , endocrinology
The two B-site ions Mn3+ and Mn4+ in the stoichiometric spinel structure LiMn2O4 form a complex, columnar ordered pattern below the charge-ordering transition at room temperature. On further cooling to below 66 K, the system develops long-range antiferromagnetic order. In contrast, whereas lithium-substituted Li[Mn2?xLix]O4 also undergoes a charge-ordering transition around room temperature, it only displays frozen in short-range magnetic order below ? 25–30?K. We investigate to what extent the columnar charge-order pattern observed in LiMn2O4 can account for the measured magnetic ordering patterns in both the pure and Li-substituted (x = 0.04) compounds. We conclude that eightfold rings of Mn4+ ions form the main magnetic unit in both compounds (x = 0,0.04), and that clusters formed out of these rings act as superspins in the doped compound
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